On boot up I get error message saying ''a diskread error occurred'' It is an Avent Notebook 4489

What was the message? May be the HDD is bad? unplug, remove battery, plug in, reboot. Try to do a restore or recovery.

Try this links:
Troubleshooting No LED Lights Glow During Startup or Boot HP Notebook PCs - Troubleshooting Blink Codes or Beep Codes that may Occur During Startup or Boot , or BIOS Beep Codes - For Hp and Compaq Desktop Computers (United States - English) Troubleshooting Black Screen with no Error Messages that may Occur During Startup or Boot HP Notebook PCs - Troubleshooting Black Screen Error Messages that May Display During Startup or Boot HP Notebook PCs - Troubleshooting Blue Screen Error Messages that May Display During Startup or Boot HP Notebook PCs - Troubleshooting Windows Logo Screen Error Messages that May Display During Startup or Boot Using HP Support Tools to Update HP Software, Drivers, and BIOS with Windows 7 . Using HP Update Tools to Update HP Software, Drivers, and BIOS with Vista Updating the BIOS or ROM for Notebooks Running Windows XP Updating Drivers and Software with Windows Update

This issue is due to This issue occurs because the Common Log File System (Clfs.sys) driver does not fix the $TxfLog file when the file is corrupted. In addition to the Stop error message, Windows Vista may not start during startup until the offending disk is removed from the computer.

Solution : Find the hotfix available from the source http://support.microsoft.com/contactus/?ws=support

If the system is not booting at all, you may have to get a Avent recovery disk and get the OS reinstated. Please write back for any further help and support.Good Luck.

Sounds like your hard drive has is failing. You will need a clean install of your operating system! It may also be that your hard drive has failed completely with knackered sectors. Now would be a good time to buy another hard drive. They are pretty cheap on ebay.

There is no factory reset on Windows. The only reset is to put in your system disc, format the computer and re-install Windows but understand you WILL LOOSE ALL YOUR FILES and saved documents, music and such. You can do some other things like hitting F8 while it's starting to boot up and get into the boot menu. This allows you to try and boot up in SAFE MODE. You can try this and then reboot and see if it goes back into Windows. You can also try LAST KNOWN GOOD CONFIGURATION from this menu. This will change your system back to the same settings that it used the last time it successfully booted up. If you have files that you value on the system though I would consult a professional and get their help fixing this problem.

PXE or Pixie errors occur when the system tried to boot to the network connection and failed. This error usually occurs when the hard drive fails. If your system does boot to windows and you are just getting the error, then you can change the network card setting in BIOS to turn PXE boot off.
If the error occurs and the system doesn't boot to the hard drive, then the hard drive has most likely failed.

You operating system is corrupted meaning that your harddrive has failed or you got a bad virus. Only fix is having the operating system reinstalled and mostly likely that data is lost. Sorry to have to break the news to you and hope that you can get this resolved.

it wont open when power is turn on,i keep getting ,(camera has experienced an error)(please reset your camera)this number accompanies the message-00000018-4489-957-000,ive read the manuel nowhere does it say how to reset, help ?

go to bios and see there whether it is showing showing your hard disk or not if it is showing then re-install your XP again format your hard disk with the slow formating option,while re-installing it.

check if the little metal lens cover is stuck open.  Mine was stuck open, so I just smacked the camera against my hand and the cover popped closed.  Then the camera turned on normally...